1- Download JDK Javadoc in CHM format
You can download Jdk Javadoc in CHM format at:
In the first open CHM file can you get an error message as shown below:
Need to fix the error, right-click Jdk9.chm select Properties, and click the "Unblock".
You want to look up the class String, or the Constructors of String?
Or search for a method, or field is named "floor", you can get the information of the class where has method, or this field
And click on the results to lookup how to use it: